speech threshold
https://gyazo.com/bbab6c3794b73d72f2ec7d8209625bbb
A story about a park being closed down because people living near the park complained about the noise of children's voices.
Lots of people happy to have a park.
I think it's natural and I don't speak up about it. People who think kids in the park are too loud.
Complain loudly
If each person's opinion is combined, the park survives. However, the "cost of expressing an opinion" is so great that a large number of smaller opinions are not expressed and are considered zero.
A digital technology-based opinion system can be a means of improvement.
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